Sxi playing up

OK, bought a 1997 sxi 750, completely rebuilt engine, all good with dry pipe, problem is after about a hour it gets a bit crap then drops down to 1 cylinder, I thought it was electrical so changed coil caps and plugs, no change, same problem, so bought a rewound stator put that on, no change same problem, really don't know what to do next, any help appreciated
 
did you change the coil leads as well....have you tested the resistance between the two plug caps ? on ski's this old its best to pull the coil and replace the leads entirely with new msd lead wires.
 
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